Pull Up Assist Bands Set by Functional Fitness. Heavy Duty Resistance and Assistance Training Band LASTING DURABILITY | Our 41 latex fitness bands are made with quality and comfort in mind. Made of natural rubber latex - 99.998% free of soluble proteins - they can stretch up to 2 1/2 times their original length. The heavy duty wear-resistant design stands the test of time COMBO SET + eGUIDE | Includes Black Band (30-50 lbs) & Green Band (50-120 lbs) PLUS free e-Guide with every purchase! Our resistance bands are great for Pull Up assistance, Powerlifting, CrossFit, Physical Therapy, mobility work and home workouts LIFETIME WARRANTY | We stand by the quality of our products and offer a lifetime warranty; if for any reason you are not satisfied with your resistance bands, simply send them back for a full refund or replacement. ULTRA VERSATILITY | Our unique 41 closed loop bands work for assisted Pull Ups, Powerlifting, Physical Therapy, Pilates, Calisthenics, Target Stretching, Toning Exercises and Full-body workouts. There are 200+ exercises with these resistance bands. WHICH BAND IS RIGHT FOR ME | Our band guide is located in the product images and offers assistance selecting the tension level that is right for your workout - To increase the intesity level, simply combine multiple workout bands to customize the level of tension